package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisWorker {

    private static final long BEGIN_TIMESTAMP = 1640995200L;

    private StringRedisTemplate stringRedisTemplate;

    public RedisWorker(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    public long nextId(String keyPrefix){

        //生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSeconds = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSeconds - BEGIN_TIMESTAMP;

        //生成序列号
        //获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //自增长
        long count = stringRedisTemplate.opsForValue().increment("icr:"+keyPrefix+":"+date);

        return  timestamp<< 32 | count;

    }
}
